D. Suggested Enrichment/Reinforcement Activity/ies A. Directions: Look around your house. List all the simple machines that you can see. Classify
them as lever, inclined plane, and wheel and axle. Manipulate them and choose one among
them that you appreciate much of its usefulness and state why.​

In an experiment examining the effects tai chi on arthritis pain, callahan (2010) selected a large sample of individuals with doctor-diagnosed arthritis. half of the participants immediately began a tai chi course and the other half (the control group) waited 8 weeks before beginning. at the end of 8 weeks, the individuals who had experienced tai chi had less arthritis pain that those who had not participated in the course.